module Docs  class Opengl < FileScraper    self.type = 'simple'    self.name = 'OpenGL'    self.root_path = 'index.php'    self.links = {      home: 'https://registry.khronos.org/OpenGL-Refpages/'    }    html_filters.push 'opengl/entries', 'opengl/clean_html'     # indexflat.php is a copy of index.php    options[:skip] = %w(indexflat.php)     options[:attribution] = ->(filter) {      # copyright is the last section in these pages      return filter.css('h2:contains("Copyright") ~ p').inner_text    }     version '4' do      self.root_path = 'index.php'      self.release = '4'      self.base_url = "https://registry.khronos.org/OpenGL-Refpages/gl#{self.version}/"    end     version '2.1' do      self.root_path = 'index.html'      self.release = '2.1'      self.base_url = "https://registry.khronos.org/OpenGL-Refpages/gl#{self.version}/"    end  endend